DISCLAIMER: I'm not a graphics or OpenGL expert, so if something is dumb or
doesnt make sense please let me know.
Hi,
I am trying to use OSG to create an application for a real time Linux system
without a windowing system.
To get OSG to work properly, I create my own GraphicsContext and assign it to
each Camera I'm using. Within the GraphicsContext I set up EGL and DRM.
My GraphicsContext source code:
This works fine and I can run my application perfectly on the real time
machine. However, if I switch from a single threaded rendering mode to
multithreaded mode, I get a segmentation fault error and I'm having trouble
understanding why.
I debugged the application via remote debugger and the segmentation fault
happens here:
Code:
Shader::PerContextShader::PerContextShader(const Shader* shader, unsigned int
contextID) :
osg::Referenced(),
_contextID( contextID )
{
_shader = shader;
_extensions = GLExtensions::Get( _contextID, true );
_glShaderHandle = _extensions->glCreateShader( shader->getType() );
requestCompile();
}
The function ptr "glCreateShader" is set to 0x0. After double checking it seems
like the method to assign the function pointers fails because no valid OpenGL
context can be found. The application also prints
> Error: OpenGL version test failed, requires valid graphics context.
So now I'm wondering why this only happens if I enable multithreaded rendering,
and not for singleThreaded rendering. What exactly do I need to change so that
multithreading works on the real time machine?
Thank you!
Cheers,
mille25
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=66895#66895
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